Gear Engineering Machinery Model Assembly: Wind-up Pendulum Electric Mechanical Clock

Core Mechanical Structure Analysis

1. Ring Gear Transmission System

Core Components: 20cm diameter internal gear ring + 3 sets of speed-changing gears (24-tooth, 16-tooth, 8-tooth bevel gears/cylindrical gears)

Transmission Logic: The motor drives the 16-tooth gear, achieving a deceleration effect of "low motor speed → uniform hand movement" through "24-tooth reduction gear → 8-tooth bevel gear steering → internal gear ring linkage," perfectly replicating the timekeeping proportions of a mechanical clock.

2. Pendulum Linkage Module

Structural Design: Employs a "double connecting rod + eccentric wheel" structure. When the gear set rotates, it drives the eccentric wheel to rotate, which in turn pulls the pendulum to reciprocate in a 5°-8° range via the connecting rod. The oscillation frequency precisely matches the hand speed (12 oscillations every 60 seconds).

Interactivity: When manually rotating the internal gear ring, the interaction between the pendulum's swing and the hand's rotation can be observed simultaneously, providing an intuitive understanding of the principle of "force transmission and direction conversion."

3. Dual-Mode Power System

Electric Mode: After connecting the PF-L motor and battery box, turning on the switch enables "automatic pendulum swing + hour/minute hand rotation at a 1:12 speed ratio," with a continuous working time of approximately 4 hours (using 2 AA batteries).

Manual Mode: After removing the motor module, the entire transmission system can be manually driven by rotating the top gear knob, experiencing the damping and tactile feedback of the mechanical structure.

Assembly Process and Experience

1. Phased Assembly Guide

Phase One (Frame Construction): Takes approximately 30 minutes to complete the basic frame of the "black cross bracket + ring-shaped internal gear ring." The internal gear ring is secured using 8 "L-shaped corner beams + pivot pins" to ensure frame stability.

Phase Two (Transmission Assembly): Approximately 60 minutes. Assemble the "motor drive gear set → bevel gear steering module → pointer shaft fixing bracket" sequentially. Pay attention to gear meshing clearance during this phase (a 0.5mm clearance is recommended to avoid jamming).

Pendulum and Hand Installation: Approximately 20 minutes. Install the red and yellow hands (minute hand 12cm long, hour hand 8cm long) and the red plastic pendulum. Adjust the connecting rod length to ensure the pendulum swings smoothly without jamming.

2. Assembly Details and Highlights

Utilizes a double fixing structure of "shaft pin + cross shaft," with "friction pins" used in key transmission parts to enhance stability;

Anti-slip clips are designed at the pointer shaft to prevent the hands from falling off during operation;

The motor module features a detachable design, which does not affect the integrity of the manual mode assembly.

Product Functions and Scenarios

1. Functional Highlights

Mechanical Principle Teaching Aid: Provides intuitive demonstrations of physics concepts such as gear reduction, force direction, and linkage mechanisms, suitable for high school physics experiments or mechanical enthusiasts.

Dynamic Desktop Ornament: In electric mode, the pendulum swings at a constant speed while the hands move slowly, combining industrial-style decoration with mechanical interactivity.

2. Precautions

Do not manually interfere with gear operation while the motor is running to avoid wear and tear on parts.

It is recommended to use a "shaft and pin separator" during assembly to assist disassembly and prevent damage to parts.